Convective heat transfer to supercritical hydrogen under high heat flux is a complex phenomenon in nuclear thermal propulsion (NTP), which has been regarded as a promising technology for human space exploration in the following decades. In this paper, concentration is mainly focused on exploring convective heat transfer to supercritical hydrogen in a strongly heated straight tube numerically based on several turbulence models. Differences between the standard k-ε model and the sst k-ω model in terms of the simulation results like the wall temperature profile, the bulk parameters, the velocity magnitude distributions and the turbulence kinetic energy profile are discussed in the first part. And the approach is validated through comparisons with experimental data. In the second part, the effects of heat flux is under investigation, combined with four turbulence models where the RSM model and the V2F model are newly included. Generally, this work will contribute to the design and analysis of nuclear thermal propulsion system.

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